LA Subway Scanner, As Seen In 'Total Recall'

The portable scanners project waves to do full-body screenings of passengers walking through a station without slowing them down.

They scan for metallic and non-metallic objects on a person's body, can detect suspicious items from 30 feet (nine metres) away and have the capability of scanning more than 2,000 passengers per hour.

Officials from the Los Angeles County Metropolitan Transportation Authority would not say how many of the machines were being purchased, but said they would be rolled out in subway stations in the "coming months".